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Comprehensive methods of vertically-oblique sounding ionograms processing for determining parameters of ionospheric channels

Keywords:

V.A. Ivanov – Dr.Sc. (Phys.-Math.), Professor, Head of the Chair of Higher Mathematics, Volga State University of Technology. E–mail: IvanovVA@volgatech.net
D.V. Ivanov – Dr.Sc. (Phys.-Math.), Professor, Vice-Rector for Research and Innovation Activity, Volga State University of Technology. E–mail: IvanovDV@volgatech.net
N.V. Ryabova – Dr.Sc. (Phys.-Math.), Professor, Head of the Chair of Radio Engineering and Communication, Volga State University of Technology. E–mail: RyabovaNV@volgatech.net
А.V. Malcev – Senior Lecturer, Chair of Radio Engineering and Communication, Volga State University of Technology. E–mail: MalcevAV@volgatech.net
А.B. Egoshin – Ph.D. (Eng.), Associate Professor, Chair of Radio Engineering and Communication, Volga State University of Technology. E–mail: EgoshinAB@volgatech.net
А.R. Lashchevsky – Ph.D. (Phys.-Math.), Associate Professor, Chair of Higher Mathematics, Volga State University of Technology. E–mail: LashhevskijAR@volgatech.net
М.I. Ryabova – Ph.D. (Phys.-Math.), Associate Professor, Chair of Higher Mathematics, Volga State University of Technology. E–mail: RyabovaMI@volgatech.net
А.А. Chernov – Ph.D. (Eng.), Associate Professor, Chair of Radio Engineering and Communication, Volga State University of Technology. E–mail: ChernovAS@volgatech.net


Now forecasting and monitoring of the atmosphere of Earth and its ionized components - ionospheres belong to critical technologies therefore development of methods of radio physical sounding of an ionosphere is an actual scientific problem. According to the ionograms received as a result of sounding, various characteristics of an ionosphere and the communication HF lines are defined. Thus it is considered that sounding shouldn't create hindrances to other radio engineering systems of HF range. It is possible only at reduction of power of a sounding signal. For sounding military systems reduction of their power will lead to increase of power reserve that is an important merit. In work results of realization of modern approach are presented in the solution of a problem of removal of hindrances from ionograms of vertically - oblique sounding of an ionosphere taking into account a situation arising at compression of elements of continuous chirp signal in frequency area. It is shown that the presented and studied complex algorithm of processing in combination with a method of rejection of the concentrated hindrances at the exit of system of compression and a method Cannes provides almost full removal of hindrances of the various nature on ionograms and gives the chance of further processing in an automatic mode. The factors influencing selection of techniques, a part of complex algorithm are revealed: extent of the sounding radio line, time of day, solar activity and season of year. Recommendations about drawing up complex adaptive algorithm are made. The effective algorithm of restoration of a profile of electronic concentration of the ionosphere developed recently, based on IRI model use is presented.
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